Yarn drawing machine

ABSTRACT

A yarn drawing machine draws yarn between a feed roller and a draw roller which has an associated separator roller for spacing the turns of yarn. The separator roller has a flange of which the peripheral surface frictionally contacts the yarn as it passes onto the separator roller initially so as to false twist the yarn; the twist runs back along the yarn to a region in which the yarn is heated. The yarn is thereby given a potential crimp which is realized when the yarn is relaxed.

O Un1ted States Patent 1 13,s81,487

[72] Inventors William Charles Loomes; [56] References Cited Arthur James Marrs, both of Derby; Peter UNITED STATES PATENTS gfi i gj cumber'and' 2,410,419 1 1/1946 Belezza .1 57/77.4 g 3,094,834 6/1963 Deeley etal. 57/51.6X 1211 Appl No. 838,591

- 3,261,154 7/1966 M1chalek 57/34 [22] F1led July 2, 1969 3,287,888 11/1966 Ch1dgey 57/34X [45] Patented June 1, 1971 3,435,603 4/1969 R1ce 57/34 [73] Ass1gnee Courtaulds Limited 3,457,338 7/1969 Lefevre 57/55.5X England 3 462 938 8/1969 Mehta 57/34 [32] Priority July 16 1968 [33] Great Britain FOREIGN PATENTS [31] 33,769/68 1,098,545 H1968 Great Britain 57/34 Primary Examiner-Donald E. Watkins AttorneyDavis, Hoxie, Faithful] and Hapgood [54] g g S m ABSTRACT: A yarn drawing machine draws yarn between a alms rawmg feed roller and a draw roller which has an associated separator [52] US. Cl 57/34, ro1ler for spacing the turns of yarn. The separator roller has a 57/77.4 flange of which the peripheral surface frictionally contacts the [51 Int. Cl D02g 1/08, yarn as it passes onto the separator roller initially so as to false 002g 1/04, D01h 7/92 twist the yarn; the twist runs back along the yarn to a region in [50] Field of Search 57/34, 34 which the yarn is heated. The yarn is thereby given a potential crimp which is realized when the yam is relaxed.

PATENTED JUN 1 1971 SHEET 1 OF 2 INVENTOR WILLIAM CHARLES LOOMES, ARTHUR JAMES B MARRS ANDPEPER HEFFERNAI Davis, Hoxie, Faithfull & HapgooMTTOR/VE Y PATENIEU Jun 1 [an SHEET 2 BF 2 IN VEN TOR ARTHUR JAMES HEFFERNAN' WILLIAM CHARLES LOOMES, MARRS AND PETER Y BY Davis, 110x10, I-althiull & IIannood lfAlltN DRAWIING MAlCllllllltlE This invention relates to a machine for drawing thermoplastic, continuous filament yarn and is concerned with such a machine which is adapted for imparting crimp potential to the drawn yarn. The term yarn" is to be understood as meaning a monofllament yarn or multifilament yarn with little or no twist, such as, for example, the polyamide or polyester yarns which are commonly fed to a draw-twisting machine.

A draw-twisting machine which is adapted for imparting crimp potential to a yarn is described in British Pat. Specification No. 890,053. Basically the machine described comprises a feed roller and a draw roller with a snubbing pin between them and a yarn heater between the snubbing pin and the draw roller. The draw roller has a flange which frictionally contacts the yarn as it passes onto the draw roller so as to false twist the yarn by virtue of the greater linear speed of the flange compared with that of the circumference of the draw roller. The twist runs back along the yarn as far as the snubbing pin and in effect, the action on the yarn in that part is a drawing of a hot, false-twisted yam. This produces the crimp potential in the yarn, the crimp being realized on subsequent relaxation. The potentially crimpable yarn passes off the draw roller and is then collected on a ring twisting spindle.

We have now made a modification of such a machine which has certain advantages.

According to this invention, a yarn drawing machine comprises a feed roller and a draw roller for drawing yarn passing between them, a separator roller associated with the draw roller and for spacing the turns of yarn on the draw roller, the separator roller having a flange with a peripheral surface for frictionally contacting the yarn as it passes initially onto the separator roller so as to false twist the yarn, and means for heating the yarri in the region before it passes to the flange of the separator roller.

The separator roller may be driven or idling, in the latter case the yarn frictionally rotating it.

One advantage of mounting the flange on the separator roller rather than the draw roller is that, with machine space at a premium, the smaller diameter of the separator roller allows a greater flange to roller diameter ratio with the result that a greater degree of false twist can be inserted into the yarn. Also the direction of the twist, S or Z, can be altered simply bv changing the lace-up of the yarn on the draw and separator rollers between normal lace-up and reverse lace-up.

A further advantage is obtained if the separator roller is made idling in that if there is a yarn breakage there is no ensuing yarn tangle around the flange as occurs when the flange is on the draw roller. Thus there is no need to stop the draw roller and no need to cut through a yarn tangle, which action can result in damage to the flange.

The flange may be made of a hard rubber material. The contour of its peripheral surface may correspond to the surface of rotation generated by a straight or curved geodesic line connecting the locations at which the yarn makes and breaks contact with the peripheral surface. The feature of a contour generated by a curve geodesic line is described in British Pat. Specification No. 890,053.

The yarn heating means may be of any type which is used in this field, for example a hot plate, steam, a high frequency electrical heater or an infrared heater. A snubbing pin may also be incorporated on the machine between the feed roller and the draw roller for determining the length of yarn along which the twist runs back, and this may be heated, for example by electrical resistance wires, so as to heat the yarn. The means for heating the yarn may extend along the yarn path between the snubbing pin and the flange on the separator roller.

Other features which may be included are means for collecting the yarn after it passes off the draw roller, for example a ring twister, and a mounting for a yarn package oft which yarn is to be pulled by the feed roller.

The invention is illustrated by the drawings in which:

FIG. 1 is a diagrammatic side elevation of a single station on a draw-twisting machine,

H6. 2 is a perspective diagram of the draw roller and the separator roller showing the flange and the yarn path, and

HO. 3 is a diagrammatic side elevation of the flange on the separator roller and showing the yarn path over the flange.

Referring to the drawings, a cheese 1 of nylon yarn 2 is mounted on a headrail 3, the yarn being unwound off the cheese by a centrally mounted guide 4 which is suspended from a guiderail 5.

The yarn is drawn off the cheese by a pair of feed rollers 6 and 7 and is then passed by way of a snubbing pin 8 and an electrical heater 9 to draw roller 10 and its separator roller 11. The draw roller it) is rotated at a faster speed than the feed rollers 48 and 7 so that the yarn is stretched between the snubbing pin 8 and the draw roller.

The separator roller 11 is also driven, its rate of rotation being such that its peripheral surface moves at the same speed as the draw roller.

A hard rubber flange 13 is mounted on the separator roller ll near to one end and rotates with the roller. However, because of its greater diameter, its peripheral surface 14 has a greater linear speed than that of the separator roller. This peripheral surface 14 is curved, as shown best in FIG. 3, so that yarn passing onto the separator roller at an acute angle to its axis of rotation wraps around the peripheral surface to give a good area of frictional contact. Because of the greater linear speed of the peripheral surface 14: the yarn is false-twisted and the twist runs back along the yarn, through the heater 9 as far as the snubbing pin 8. This combined action of twisting and stretching the yarn whilst heating it gives it a potential crimp which is realized when the yarn is relaxed.

The yarn passes down off the draw roller 10, through a balloon guide 15 mounted on a rail 16 and through a traveller (not shown) running around a ring 17, and then onto a bobbin 18. The ring 17 is mounted on a ring rail 19 which is rigidly connected to the balloon guide rail 16 :so that they reciprocate together axially of the rotating bobbin.

As an example, twistless nylon 6 (Celon") 40/10 multifilament yarn was processed on the apparatus described and shown in the drawings. The linear speed of the feed rollers was I metres per minute and that of the draw roller was 730 metres per minute. The temperature of the heater was I90 C. With a separator roller having a diameter of 2.38 cms. and a rubber flange of diameter 5.7 cms., approximately 4 turns per cm. of false twist were inserted into the yarn by the flange.

What we claim is:

l. A yarn drawing machine comprising a feed roller and a draw roller for drawing yarn passing between them, a separator roller associated with the draw roller and for spacing the turns of yarn on the draw roller, the separator roller having a flange with a peripheral surface for frictionally contacting the yarn as it passes initially onto the separator roller so as to false twist the yarn, and means for heating the yarn in the region before it passes to the flange of the separator roller.

2. A yam drawing machine as claimed in claim 1 in which the separator roller is an idling roller.

3. A yarn drawing machine as claimed in claim 1 in which the flange on the separator roller is made of hard rubber.

d. A yarn drawing machine as claimed in claim 1, including a snubbing pin located between the feed roller and the draw roller for determining the length of yarn along which the false twist runs back.

5. A yarn drawing machine as claimed in claim 4 in which the means for heating the yarn extends along the yarn path between the snubbing pin and the flange on the separator roller.

ti. A yarn drawing machine as claimed in claim ll including a mounting for a yarn package off which yarn is to be pulled by the feed roller.

7. A yarn drawing machine comprising a feed roller and a draw roller for drawing yarn passing between them, a separator roller associated with the draw roller and for spacing the turns of yarn on the draw roller, the separator roller having a flange with a peripheral surface for frictionally contacting the yarn as it passes initially onto the separator roller so as to false 84 A yarn drawing machine as claimed in claim 7 in which the means for collecting the yarn comprises a ring twister.

Disclaimer 3,581,487.William Charles Loomes and Arthur J ames Mar'rs, Derby, and Peter H efieman, Carlisle, Cumberland, England. YARN DRAXVING MACHINE. Patent dated June 1, 1971. Disclaimer filed Dec. 28, 1971, by the assignee, Uom'taulds Limited. Hereby enters this disclaimer to claims 1 t0 8, inclusive, of said patent.

[Ofiz'cz'al Gazette March 2], 1972.] 

2. A yarn drawing machine as claimed in claim 1 in which the separator roller is an idling roller.
 3. A yarn drawing machine as claimed in claim 1 in which the flange on the separator roller is made of hard rubber.
 4. A yarn drawing machine as claimed in claim 1, including a snubbing pin located between the feed roller and the draw roller for determining the length of yarn along which the false twist runs back.
 5. A yarn drawing machine as claimed in claim 4 in which the means for heating the yarn extends along the yarn path between the snubbing pin and the flange on the separator roller.
 6. A yarn drawing machine as claimed in claim 1 including a mounting for a yarn package off which yarn is to be pulled by the feed roller.
 7. A yarn drawing machine comprising a feed roller and a draw roller for drawing yarn passing between them, a separator roller associated with the draw roller and for spacing the turns of yarn on the draw roller, the separator roller having a flange with a peripheral surface for frictionally contacting the yarn as it passes initially onto the separator roller so as to false twist the yarn, means for heating the yarn in the region before it passes to the flange of the separator roller, and means for collecting the yarn after it has passed off the draw roller.
 8. A yarn drawing machine as claimed in claim 7 in which the means for collecting the yarn comprises a ring twister. 